CN116261860A

CN116261860A - Acoustic device for emitting transverse sound waves in a gaseous environment

Info

Publication number: CN116261860A
Application number: CN202080104332.8A
Authority: CN
Inventors: D·赫格尔
Original assignee: Sotis Co ltd
Current assignee: Sotis Co ltd
Priority date: 2020-08-10
Filing date: 2020-11-23
Publication date: 2023-06-13
Also published as: US11758330B2; WO2022034370A1; JP2023536399A; US20220345823A1; EP4195698A1; KR20230012575A; RU2744773C1

Abstract

The device of the present invention includes a housing, a planar diaphragm, and an acoustic vibration driver of a transverse acoustic wave. The housing is made in the form of a supporting frame and the sound emitting rectangular planar membrane is fixed to said frame. The membrane is made in the following form: a honeycomb layer, a surface layer bonded to the honeycomb layer from both sides, and a stable impregnating composition covering the surface layer. The acoustic vibration driver is made in the form of an acoustic vibration exciter comprising a ferrite portion of a magnetic core. One of the ends of the acoustic vibration exciter is affixed to the planar diaphragm within a dedicated line passing along the surface of the rectangular diaphragm, the dedicated line extending from either apex of the rectangular diaphragm and terminating at a point on the opposite horizontal side of the diaphragm relative to the apex, the point being located at a distance of 2/3 of the opposite horizontal side in the horizontal direction.

Description

Acoustic device for emitting transverse sound waves in a gaseous environment

Technical Field

The invention is applicable to acoustics. It can be used as a loudspeaker for consumer use, which operates on the principle of resonance excitation based on flexural anti-phase vibrations, and then emits transverse sound waves into the air (a wave process in which the shear vibrations of molecules are perpendicular to the wave propagation direction).

Background

From the articles of S.B. Karawa gold and O.N. Karawa Jin Na (http:// selftrans. Narod. Ru/v2_1/diagnostics 03/diagnostics 3rus. Html) (see page 4), it is known that the use of two counter-phase transmitting acoustic films as sound sources for exciting transverse waves in a gaseous environment is sufficient.

In addition, several devices capable of generating transverse acoustic waves can be distinguished in theory according to the background of the invention. The several devices include several well known instruments such as acoustic guitars (acoustic guitars), grand pianos (grand pianos), drums, violins, etc., wherein the resonator body or membrane (in the case of a drum) acts as a key element for forming the transverse sound waves. The task of designing and producing such devices is not to ensure efficient generation of transverse wave radiation in a wide frequency range and with specific signal characteristics. The ability of such a device to emit sound with a transverse wave component is therefore rather random and practically impossible to adjust the radiation parameters, which makes the device unsuitable for use in the technical field proposed by the present invention.

The closest technical solution may be considered to be the general loudspeaker set forth in russian federal patent No. 2692096 filed on 21, month 06, 2019. This speaker includes a flat membrane, an excitation unit, a housing forming a cavity in which the membrane and the excitation unit are located. The housing has a hole on one surface and the end of the excitation unit abuts against the end edge of the membrane such that the excitation unit is excited in the same direction as the plane direction of the membrane and the excitation unit is also rigidly mounted on the housing. The film forms a curved portion that is curved from a side where one end of the excitation unit is disposed to an opposite side of the other end and is positioned to cover the opening of the housing. The disadvantage of this solution is the insufficient working efficiency.

Disclosure of Invention

The proposed invention solves the following tasks:

improving the efficient operation of the acoustic device for transverse wave radiation,

extending the operating frequency range to an audibility limit of 20Hz to 20,000Hz,

enabling control of the wave generation process over a wide range, making the device compact compared to simulation, excluding high voltage components (10 kV to 30 kV) in the device circuitry,

the efficiency of generating a low frequency signal with a transverse component of sound waves is improved.

The technical result is an improved efficient operation of the acoustic device for transverse wave radiation, an extended operating frequency range, an improved efficiency of generating low frequency signals with transverse components of sound waves.

The technical result is achieved by an acoustic device for emitting transverse sound waves in a gaseous environment, comprising a housing, a flat membrane, and an acoustic vibration driver for the transverse sound waves.

The housing is made in the form of a support frame and a sound emitting flat rectangular membrane is fixed to the frame. The film is made in the following form: a honeycomb layer, a surface layer bonded to the honeycomb structure from both sides, and a stable impregnating composition based on polyurethane primer and varnish covering the surface layer. The acoustic vibration driver is made in the form of at least one acoustic vibration exciter comprising a ferrite portion of a magnetic circuit, and one end of the at least one acoustic vibration exciter is attached to a flat sheet membrane within a dedicated line passing along the plane of the rectangular membrane, the dedicated line emanating from either top of the rectangular membrane and ending at a point on the opposite top of the horizontal side of the membrane, the point being located at a distance of 2/3 of the opposite side of the membrane from the top in the horizontal direction.

The proposed invention makes it possible to design and implement compact and efficient devices in the field where it is desired to create transverse wave acoustic radiation in a gaseous environment, not only for the purpose of studying the properties of such radiation, but also for its practical application, for example in the form of loudspeakers with improved sound quality.

Drawings

Fig. 1-a general view of a device emitting transverse acoustic waves in a gaseous environment, indicating all the main elements,

figure 2-a rear view of a device emitting transverse acoustic waves in a gaseous environment,

figure 3-a schematic representation of the conditions under which transverse sound waves occur in a gaseous environment,

figure 4-external view of a device emitting transverse sound waves,

fig. 5-the location of a dedicated (orange) line in the plane of the sound membrane, at which location it is suggested to place at least one or several acoustic vibration exciters.

Detailed Description

The device (fig. 1) for emitting transverse sound waves proposed by the present invention comprises: a support frame (1); a sound producing film (2); an acoustic vibrating drive (3) comprising parts of a ferrite magnetic circuit and proposed coils of different types: flat coils, square (rectangular) coils, corrugated flat coils, cylindrical (circular) coils, star-shaped coils; the rear support top cover (4) of the driving machine.

For example, an acoustic vibration driver (3) comprises an acoustic vibration exciter (or exciters) comprising a housing in which the following components are disposed: a magnetic system, a cylindrical coil fixed to the frame, a system holding the coil within the magnetic gap, and a flexible wire (flexible wire) for supplying an electrical signal to the coil. The magnetic system is made into a cylindrical permanent magnet, a ferrite ring with the cylindrical magnet, and a washer joining it into a single structure. A cylindrical coil fixed to the frame is located above the cylindrical magnet and in the gap between the cylindrical magnet and the ferrite ring. The system for holding the coil within the magnetic gap consists of the following components: two centering washers of different diameters, fixed at a distance from each other in the form of concentric corrugated discs; an inner hole attached to the cylindrical coil and attached to the frame; and an outer periphery bonded to the housing; and a cord that supplies an electrical signal to the coil, stitched into one of the centering washers and welded at one end to the coil terminal and at the other end to the outer contact group. The cylindrical coil frame is attached to the sound generating film (2).

The sound membrane (2) is made of a lightweight and rigid material. The sound-emitting film (2) is a sandwich structure comprising a honeycomb layer, a surface layer bonded to the honeycomb structure from both sides, and a stable impregnating composition based on polyurethane primer and varnish covering the surface layer.

Such a membrane (2) starts to transmit a travelling wave structure (traveling wave structure) on a surface formed by an acoustic vibration driver (3) attached to the membrane surface. Repeated reflections of waves traveling on surfaces of limited propagation velocity in the film material from the edges of the film itself create resonance tuned frequency dependent modulations that are localized region by region over the area of the panel. These modulations have a different characteristic: which occur in the form of diametrically opposed balanced oscillations within an indivisible sound membrane (2).

For ease of understanding, these opposing bending vibrations may be represented as a set of incoherent point acoustic emitters (speakers) that are 180 degrees out of phase with each other, see FIG. 3. This mode of operation of the proposed acoustic transmitter is fundamental and necessary because the effective sound signal generation process is stopped in a mode beyond the resonance balance formation of the opposite modulation and the conditions necessary for the wave transverse component formation do not occur.

In addition, many practical experiments have resulted in the creation of a dedicated EB line (see fig. 5) passing along the plane of the sound-emitting membrane within which the acoustic vibration exciter or several of the acoustic vibration exciters should be placed such that the point of the rotation axis of the exciter lies on the dedicated line or intersects the front projection of the exciter circuit placed in the vicinity of the dedicated line. Thus, if the sound emitting membrane is considered whose angle represents points A, B, C and D (see fig. 5), the dedicated "orange" line that the actuator is fitting will pass from point B to point E. Conversely, E is a point on the DC side of the film that divides the DC segment in the following proportions: de\ec= 1\2. One or more vibration exciters may be positioned within the EB line. For a technical solution with one acoustic vibration exciter in such a line, it is necessary to determine the X point according to the following ratio: EB/xb=1.62. The orange line EB may naturally be reflected symmetrically along any symmetry axis of the film.

The advantages of the form of dedicated lines in the membrane area of the proposed technical solution, assuming that the excitation source fits within the membrane area, will ensure an optimal distribution of resonance modulation in the membrane area, which in turn has a positive effect on the uniformity of the amplitude-frequency response, and also ensures the naturalness of sound (which is closely related to the reduction of the total amount of distortion, phase shift caused by the operation of the loudspeaker system) and the maximum frequency range in the operation of such a system.

In the acoustic device of the present invention, no special measures are required to maintain the condition in which the transverse acoustic wave exists. The resonant mode of operation of such a device assumes that suitable conditions for generating and maintaining transverse waves persist. In addition, these conditions exist as transversal wave radiation in the gas in a continuous state of readiness at almost any frequency of the acoustic range, including, if necessary, a wider limitation of the low and high frequency regions. Thus, to implement radiation having a transverse component, it is sufficient to bring a single excitation source to the transmitter powered by a single channel power amplifier and apply the appropriate signal (e.g., sinusoidal signal of a particular frequency or broadband ("pink noise"), musical content, etc.).

Fig. 4 shows an external view of the proposed acoustic device for transverse acoustic wave radiation in a gaseous environment.

At the same time, it is important to emphasize that it is substantially impossible to generate transverse sound waves at the karaya device with high quality while transmitting signals of different frequencies and amplitudes to the karaya device. This is because all frequencies formed by one piston transmitter can result in acoustic doppler effect (acoustic Doppler effect). This would undoubtedly lead to the impossibility of maintaining phase consistency over the entire frequency range applied simultaneously.

In the case of the construction of the invention (the membrane is made of cellular material and the acoustic vibration exciter is in a certain position on the membrane), the lower frequencies are not dominant for the higher frequencies and no doppler effect occurs when the frequency modulation is partitioned over the area of the panel. Thus, only such a solution is possible to continuously generate and maintain transverse sound waves in the gas and to obtain the claimed technical result over the entire spectral frequency applied simultaneously.

Claims

1. An acoustic device for emitting transverse sound waves in a gaseous environment, comprising a housing, a flat membrane, an acoustic vibration driver for said transverse sound waves, characterized in that said housing is made in the form of a supporting frame, and that a sound-emitting flat rectangular membrane is fixed to said frame,

the film is made in the following form: a honeycomb layer, a surface layer bonded to the honeycomb structure from both sides, and a stable impregnating composition based on polyurethane primer and varnish covering the surface layer,

the acoustic vibration driver is made in the form of at least one acoustic vibration exciter, which comprises a ferrite part of the magnetic circuit,

one of the ends of at least one acoustic vibration exciter is affixed to the flat sheet membrane within a dedicated line passing along the plane of the rectangular membrane, the dedicated line emanating from either top of the rectangular membrane and ending at a point on the opposite top of the horizontal side of the membrane that is located at a distance of 2/3 of the distance from the top in the horizontal direction of the opposite side of the membrane.